Added test for preserve spaces at first of line

tests/src/com/fsck/k9/helper/HtmlConverterTest.java

@@ -133,4 +133,19 @@ public class HtmlConverterTest extends TestCase {
             e.printStackTrace();
         }
     }
+
+    public void testPreserveSpacesAtFirst() {
+        String message = "foo\n"
+                + " bar\n"
+                + "  baz\n"
+                + "\n";
+        String result = HtmlConverter.textToHtml(message);
+        writeToFile(result);
+        assertEquals("<pre class=\"k9mail\">"
+                + "foo<br />"
+                + " bar<br />"
+                + "  baz<br />"
+                + "<br />"
+                + "</pre>", result);
+    }
 }